Passive horn integrally formed by using thermoplastic vulcanized rubber and preparation method thereof

ABSTRACT

A passive horn integrally formed using thermoplastic vulcanized rubber includes a first outer casing, a second outer casing, an inner casing and an iron piece. The first outer casing includes a sealing ring, a folding ring and a vibrating membrane, and the sealing ring, the folding ring and the vibrating membrane are integrally injection molded into the first outer casing. A groove is disposed in the second outer casing, and the first outer casing is disposed in the groove. The back surface of the vibrating membrane is provided with a casing groove sequentially embedded with the inner casing and the iron piece. Furthermore, a preparation method of a passive horn integrally formed using thermoplastic vulcanized rubber, which, under the condition of integrated injection molding, may improve the yield rate, ensure product quality, save assembly time and labor cost, and improve production efficiency.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. patent applicationSer. No. 16/405,622, filed May 7, 2019 and claims priority ofApplication No. CN 201810428190.5 filed in China on May 7, 2018 under 35U.S.C. § 119, the entire contents of all of which are herebyincorporated by reference.

TECHNICAL FIELD

The present invention relates to a horn, in particular, to a passivehorn integrally formed by using thermoplastic vulcanized rubber and apreparation method thereof.

BACKGROUND

At present, the traditional preparation process of passive horns used inthe industry is: the hard rubber shell, the folding ring, the iron pieceand the like of the sound are separately processed, and then subjectedto surface treatment, glue coating, lamination, compaction and the like.

This multi-step processing method has low production efficiency and lowyield of finished products. The folding ring is thermoformed using athermosetting rubber material, and the scrap cannot be reused, resultingin waste. The volatiles in the surface treatment and adhesive-coatingprocess are prone to environmental pollution, and manual bonding oftencauses the boundary lines to be uneven and affect the appearance of theproduct.

SUMMARY

In order to solve the above problems existing in the prior art, thepresent invention provides a passive horn integrally formed by usingthermoplastic vulcanized rubber and a preparation method thereof.

To achieve the above object, the present invention provides thefollowing technical solution.

A passive horn integrally formed by using thermoplastic vulcanizedrubber, includes a first outer casing, a second outer casing, an innercasing and an iron piece; the first outer casing includes a sealingring, a folding ring and a vibrating membrane, and the sealing ring, thefolding ring and the vibrating membrane are integrally injection moldedinto the first outer casing; a groove is disposed in the second outercasing, and the first outer casing is disposed in the groove; the backsurface of the vibrating membrane is provided with a casing groove, andthe casing groove is sequentially embedded with the inner casing and theiron piece.

Further, the cross section of the inner casing is a T-shaped structure,and the cross section of the iron piece is an inverted T-shapedstructure, the T-shaped structure cooperating with the inverted T-shapedstructure.

Further, the iron piece is provided with two positioning holes.

Further, the positioning hole is shaped as a strip hole or a round hole.

The present invention further provides a preparation method of abovepassive horn integrally formed by using thermoplastic vulcanized rubber,including:

positioning an iron piece in a mold by means of a positioning hole;

injecting a molten plastic raw material into the mold whileinjection-molding a first outer casing, a second outer casing andwrapping an inner casing with an iron piece to form an integralstructure, wherein the first outer casing is formed by integrallyinjection-molding with a sealing ring, a folding ring and a vibratingmembrane;

after completing the injection-molding, adding water to cool to mold theproduct, then completing releasing of the mold after ejection.

Among them, the molten plastic raw material may also be injected intothe mold in the form of encapsulation, the second outer casing isinjection-molded first and the inner casing is wrapped with the ironpiece, and then the first outer casing is injection-molded, so as toform an integral structure, wherein the first outer casing is formed byintegrally injection-molding with the sealing ring, the folding ring andthe vibrating membrane.

Further, the material of the first outer casing is a thermoplasticvulcanized rubber.

Further, the material of the second outer casing and the inner casing isa composite material of PP and glass fiber.

Further, the temperature of the injection molding is 180-350 degreesCelsius, and the pressure of the injection molding is 40-200 MPa.

Based on the above technical solutions, the technical effects obtainedby the present invention are:

(1) In the passive horn integrally formed by using thermoplasticvulcanized rubber provided by the present invention, the sealing ring,the folding ring and the vibrating membrane are injection-molded into anintegral structure by using an integral injection-molding process,wherein the injection-molding process is easy to implement and thepackage is stable, so that the structure is simple, the sealing effectis good, the structure is firm, the appearance is perfect, and there isno bonding line.

(2) In the passive horn integrally formed by using thermoplasticvulcanized rubber provided by the present invention, under the conditionof integral injection-molding, the product quality is guaranteed, theassembly time and labor cost are saved, and the production efficiency isimproved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of the passive horn integrally formed byusing thermoplastic vulcanized rubber according to the presentinvention.

FIG. 2 is a perspective view of the first outer casing according to thepresent invention.

FIG. 3 is an overall view of the passive horn integrally formed by usingthermoplastic vulcanized rubber according to the present invention.

FIG. 4 is a perspective view of the second outer casing according to thepresent invention.

FIG. 5 is a cross-sectional view of the passive horn integrally formedby using thermoplastic vulcanized rubber according to the presentinvention.

FIG. 6 illustrates a preparation method of above passive horn integrallyformed by using thermoplastic vulcanized rubber according to anexemplary embodiment of the invention.

FIG. 7 illustrates a preparation method of above passive horn integrallyformed by using thermoplastic vulcanized rubber according to anotherexemplary embodiment of the invention.

Among those, the reference numerals are as follows:

1 first outer casing

2 second outer casing

3 inner casing

4 iron piece

5 positioning hole

11 sealing ring

12 folding ring

13 vibrating membrane

133 casing groove

22 groove

33 T-shaped structure

DETAILED DESCRIPTION

The present invention will be described more fully hereinafter withreference to the accompanying drawings and specific embodiments.Preferred embodiments of the present invention are given in thedrawings. However, the present invention may be embodied in manydifferent forms and is not limited to the embodiments described herein.Rather, these embodiments are provided so that the disclosure will bemore fully understood.

It should be noted that when an element is referred to as being “fixed”to another element, it can be directly on the other element or acentered element can be present. When an element is considered to be“connected” to another element, it can be directly connected to acentered element can be present simultaneously.

For ease of reading, the terms “upper”, “lower”, “left”, and “right” areused in the drawings to indicate the relative position of the referencebetween the elements, and not to limit the present application.

All technical and scientific terms used herein have the same meaning ascommonly understood by one of ordinary skill in the art to which thisinvention belongs, unless otherwise defined. The term used in thedescription of the present invention is for the purpose of describingspecific embodiments and is not intended to limit the present invention.

Embodiment 1

As shown in FIGS. 1 to 5 , a passive horn integrally formed by usingthermoplastic vulcanized rubber comprises a first outer casing 1, asecond outer casing 2, an inner casing 3 and an iron piece 4; the firstouter casing 1 includes a sealing ring 11, a folding ring 12 and avibrating membrane 13, and the sealing ring 11, the folding ring 12 andthe vibrating membrane 13 are integrally injection molded into the firstouter casing 1; a groove 22 is disposed in the second outer casing 2,and the first outer casing 1 is disposed in the groove 22; the backsurface of the vibrating membrane 13 is provided with a casing groove133, and the casing groove 133 is sequentially embedded with the innercasing 3 and the iron piece 4.

The cross section of the inner casing 3 is a T-shaped structure 33, andthe cross section of the iron piece 4 is an inverted T-shaped structure,the T-shaped structure cooperating with the inverted T-shaped structure,so that the tightness of the inner casing 3 and the iron piece 4 may beenhanced, and the connection between the two may be ensured to be firmand stable.

The iron piece 4 is provided with 2 positioning holes 5, and thepositioning hole 5 is shaped as a strip hole or a round hole.

In the present embodiment, the sealing ring, the folding ring and thevibrating membrane are injection-molded into an integral structure byusing an integral injection-molding process, wherein theinjection-molding process is easy to implement and the package isstable, so that the structure is simple, the sealing effect is good, thestructure is firm, the appearance is perfect, and there is no bondingline.

And, under the condition of integral injection-molding, the productquality is guaranteed, the assembly time and labor cost are saved, andthe production efficiency is improved.

Embodiment 2

A preparation method of above passive horn integrally formed by usingthermoplastic vulcanized rubber is illustrated in FIG. 6 and includes:

S1, positioning an iron piece in a mold by means of a positioning hole;

S2, injecting a molten plastic raw material into the mold whileinjection-molding a first outer casing, a second outer casing andwrapping an inner casing with an iron piece to form an integralstructure, wherein the first outer casing is formed by integrallyinjection-molding with a sealing ring, a folding ring and a vibratingmembrane;

S3, after completing the injection-molding, adding water to cool to moldthe product, then completing releasing of the mold after ejection. Amongthem, the temperature of the injection molding is 180-350 degreesCelsius, and the pressure of the injection molding is 40-200 MPa.

In the present embodiment, a two-color injection-molding machine is usedto simultaneously injection-mold the first outer casing, the secondouter casing and the inner casing iron piece through two sets oftwo-color injection-molding molds, that is, forming with one-timeinjection-molding to realize product production.

In the present embodiment, in step S2, the first outer casing is athermoplastic vulcanized rubber, which has the characteristics of goodweather resistance, wear resistance, good elasticity and compressiondeformation resistance of the thermoset rubber, and excellent processingproperties of the thermoplastic plastic, and may be injection-molded.The second outer casing and the inner casing is a composite material ofPP and glass fiber, which ensures the high strength of the passive hornproduced. The composites of the thermoplastic vulcanized rubber, PP andglass fiber have good adhesion under injection-molding conditions, andthe integrally injection-molding may be performed.

Embodiment 3

A preparation method of above passive horn integrally formed by usingthermoplastic vulcanized rubber is illustrated in FIG. 6 and includes:S21, positioning an iron piece in a mold by means of a positioning hole;

S22, the molten plastic raw material may be injected into the mold inthe form of encapsulation, the second outer casing is injection-moldedfirst and the inner casing is wrapped with the iron piece, and then thefirst outer casing is injection-molded, so as to form an integralstructure, wherein the first outer casing is formed by integrallyinjection-molding with the sealing ring, the folding ring and thevibrating membrane.

S23, after completing the injection-molding, adding water to cool tomold the product, then completing releasing of the mold after ejection.Among them, the temperature of the injection molding is 180-350 degreesCelsius, and the pressure of the injection molding is 40-200 MPa.

In the present embodiment, using a conventional injection-moldingmachine, i.e. a horizontal injection-molding machine or a verticalinjection-molding machine, the second outer casing and the inner casingiron piece are injection-molded in the first set of molds, then thesecond outer casing and the inner casing iron piece are placed into thesecond set of molds to injection-mold the first outer casing to form anintegral structure, so that after two sets of molds are placed on twoconventional injection-molding machines, the product is produced by twoinjection-moldings.

In the present embodiment, in step S22, the first outer casing is athermoplastic vulcanized rubber, which has the characteristics of goodweather resistance, wear resistance, good elasticity and compressiondeformation resistance of the thermoset rubber, and excellent processingproperties of the thermoplastic plastic, and may be injection-molded.The second outer casing and the inner casing is a composite material ofPP and glass fiber, which ensures the high strength of the passive hornproduced. The composites of the thermoplastic vulcanized rubber, PP andglass fiber have good adhesion under injection-molding conditions, andthe integrally injection-molding may be performed.

For the preparation method of above passive horn integrally formed byusing thermoplastic vulcanized rubber provided by the presentembodiment, the sealing ring, the folding ring and the vibratingmembrane are injection-molded into an integral structure by using anintegral injection-molding process for realizing fully automatedproduction. Under the condition of integral injection-molding, theproduct quality is guaranteed, the assembly time and labor cost aresaved, and the production efficiency is improved.

The above description is only examples and illustrative of the structureof the present invention, and the description thereof is more specificand detailed, but is not to be construed as limiting the scope of thepresent invention. It should be noted that it will be apparent to thoseskilled in the art that various modifications and improvements can bemade without departing from the spirit and scope of the presentinvention. These obvious alternatives are all within the scope of thepresent invention.

The invention claimed is:
 1. A passive horn integrally formed by usingthermoplastic vulcanized rubber, comprising: a first outer casing,comprising: a sealing ring; a folding ring; and a vibrating membranehaving a back surface provided with a casing groove; a second outercasing; an inner casing; an iron piece; and a groove disposed in thesecond outer casing and the first outer casing being disposed in thegroove, wherein the sealing ring, the folding ring and the vibratingmembrane are integrally injection molded into the first outer casing,and wherein the casing groove is sequentially embedded with the innercasing and the iron piece.
 2. The passive horn integrally formed byusing thermoplastic vulcanized rubber according to claim 1, wherein across section of the inner casing is a T-shaped structure and a crosssection of the iron piece is an inverted T-shaped structure, theT-shaped structure cooperating with the inverted T-shaped structure. 3.The passive horn integrally formed by using thermoplastic vulcanizedrubber according to claim 1, wherein the iron piece is provided with twopositioning holes.
 4. The passive horn integrally formed by usingthermoplastic vulcanized rubber according to claim 3, wherein each ofthe two positioning holes is shaped as a strip hole or a round hole.